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I think that happens becaues of the fact that games uses files on both layers. Therefore there should be some file on the dvd that says "file x2 on layer x". A backuped game will not "know" where the switch between the layers are and this can result in that file x2 might be on the wrong physicall layer.
There are some project going on over at xbox-scene though that is about making small files that has the information about where on the disc files are stored.
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